Can an unpatched server, simply stop working? Either entirely, or certain functions?
Simply yes. I know of several Coblat RAQ4 and RAQ4Rs that have been either hacked and taken over, or hacked and destroyed. If you didn't change something, and the NetBenefit folks didn't change anything, and things that used to work don't ... well I'd suggest making sure you've got a recent back-up while you've still got access to your data. Then explore securing your server. But those RAQs usually run sendmail don't they, hope that isn't open to the outside world. If you want some real answers, give us some real errors ... can't help troubleshoot a vague problem.
This is *way* off-topic though.
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Jason k Larson
/* Build a man a fire and he is warm for a day.
Light a man on fire and he is warm for the rest of his life. */